CN201656905U - Speed regulating system of a slip power feedback type asynchronous motor with large power and medium-high voltage - Google Patents
Speed regulating system of a slip power feedback type asynchronous motor with large power and medium-high voltage Download PDFInfo
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- CN201656905U CN201656905U CN2010201623948U CN201020162394U CN201656905U CN 201656905 U CN201656905 U CN 201656905U CN 2010201623948 U CN2010201623948 U CN 2010201623948U CN 201020162394 U CN201020162394 U CN 201020162394U CN 201656905 U CN201656905 U CN 201656905U
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Abstract
The utility model discloses a speed regulating system of a slip power feedback type asynchronous motor with large power and medium-high voltage, comprising a power electronic converter and a step-up transformer, wherein the power electronic converter is connected with the speed-adjusted motor rotor side in series; the step-up transformer is used for adjusting the three-phase alternating current outputted by the power electronic converter and feeding the three-phase alternating current back to a high-voltage power supply network; the power electronic converter comprises a three-phase rectifying circuit, a boost chopping circuit, a three-phase voltage source inverter, a boost chopping control unit and an inverter control unit; the boost chopping circuit is connected with the three-phase rectifying circuit in parallel; the three-phase voltage source inverter is connected with the boost chopping circuit in parallel; the boost chopping control circuit is used for controlling the boost chopping circuit; and the inverter control unit is used for controlling the three-phase voltage source inverter. The utility model has the advantages of reasonable circuit design, convenient wiring, low investment cost, good use effect and stable operating performance, and can effectively overcome the defects that in the traditional internal feedback chopping speed regulating system, the current harmonic is overlarge, the operating efficiency is low, the inversion failure is easy to occur, and the like.
Description
Technical field
The utility model belongs to the asynchronous motor drive technical field, especially relates to the high-power mesohigh asynchronous motor speed-regulating system of a kind of slip power feed-back type.
Background technology
All in all, following two kinds of technical schemes are generally adopted in present domestic mesohigh winding motor speed governing field, i.e. frequency converter timing technology and internal feedback chopping regulating speed technology.Wherein, frequency control is that present speed regualtion of AC motor field is most widely used general, the speed adjusting performance best techniques.In middle low power and low-voltage grade (below the 1000V) electric machine speed regulation field, the advantage of frequency converter and occupation rate of market are all unshakable; But, along with improving constantly of power and electric pressure, at the speed governing field of mesohigh asynchronous machine (electric pressure 3kV/6kV/10kV, more than the power 250kW), converter technology has met with great bottleneck, and promptly owing to need bear very high voltage and whole capacity, the cost of mesohigh frequency converter is very high, this causes in this field another speed adjusting technique to come into one's own and begins obtaining to use in industrial circle, promptly carries out speed regulating control from the rotor-side of alternating current machine.The subject matter of rotor-side speed governing is to be suitable for wire-wound asynchronous motor, and for the squirrel-cage high-voltage motor, then can only adopt the high voltage converter scheme to carry out speed regulating control.
If the high-voltage asynchronous motor of Wound-rotor type adopts the rotor-side series transformer to realize stepless speed regulation, its main technical scheme comprises following several: internal feedback chopping regulating speed scheme, slip power feed-back type speed-regulating scheme and doubly-fed adjustable speed scheme.At present, the main technical schemes of domestic rotor-side stepless speed regulation is an internal feedback chopping regulating speed technology, internal feedback chopping regulating speed technology is to make another one feedback winding in the stator side of high-voltage asynchronous motor, the slip power of rotor converter feedback is not by the direct feedback grid of high-tension transformer, but feed back to motor stator by the feedback winding, realize the feedback of energy indirectly.Wherein the operation principle of rotor converter is summarized as follows: at first diode rectifier bridge is a direct voltage with rotor winding three-phase AC voltage conversion, be applied on the DC side inductance, and, promptly realize a constant-current source by the average current in the high frequency chopping control realization inductance of IGBT module is remained unchanged; Constant electric current is reverse into three-phase alternating current by the thyristor inverter bridge, feeds back to the feedback winding of motor stator side at last.As seen, the core one of foregoing circuit is a DC chopped-wave, the 2nd, and current source inverter.
In the actual use, internal feedback chopping regulating speed technology is because Current Control is to realize by the single IGBT module of DC side, and therefore control is upward fairly simple, but shortcoming also clearly.At first, because the DC side inductive current is controlled so as to constant-current source, so inversion is square wave to the electric current in the three-phase feedback winding, and each phase current is discontinuous, and this causes very large current harmonics; Simultaneously, because the action of the high frequency chopping of IGBT module, make also to comprise the switching frequency harmonic component in the current waveform.These harmonic components can cause the heating of motor, cause decrease in efficiency, and because current harmonics is excessive, current source inverter can not directly be presented energy to electrical network.Each thyristor of current source inverter must be according to correct the triggering of voltage-phase of feedback winding, if false triggering, then because the energy storage effect of DC side inductance, the thyristor that is triggered can conducting, this can cause, and inductive current is instantaneous to be flow through along the AC power that connects, therefore inductive current can not descend increases on the contrary, and this phenomenon is called inversion and overturns.After the phenomenon appearance was overturned in above-mentioned inversion, the circuit of rotor converter itself but can't be protected this situation, can only cause the inverter overcurrent to burn at last.Thereby on know-why, the internal feedback chopping regulating speed is a kind of relatively backward slip power feed-back type speed adjusting technique.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, provide a kind of slip power feed-back type high-power mesohigh asynchronous motor speed-regulating system, its circuit design rationally, easy-to-connect and cost of investment is low, result of use is good, stable work in work, can solve effectively that the existing current harmonics of traditional internal feedback chopping regulating speed system is excessive, inefficiency, be prone to inversion and defective and deficiency such as overturn.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: the high-power mesohigh asynchronous motor speed-regulating system of a kind of slip power feed-back type, it is characterized in that: comprise being serially connected in by the converters of buncher rotor-side with to the three-phase alternating voltage that converters is exported and adjust and feed back to the step-up transformer of high voltage supply net, the input/output terminal of described step-up transformer joins with converters and high voltage supply net respectively; Described converters comprises and the rectified three-phase circuit that is connected in series mutually by the rotor winding of buncher, with rectified three-phase circuit mutually and the boost chopper that connects, with boost chopper mutually and the three-phase voltage source inverter that connects, the current detecting unit one that the output current of rectified three-phase circuit is detected in real time, to the rotation speed detection unit that is detected in real time by the rotating speed of buncher, according to described rotation speed detection unit and detection signal of current detecting unit and in conjunction with the boost chopper control unit of boost chopper being controlled by the buncher tachometer value given in advance, the voltage detection unit one that the output voltage of boost chopper is detected in real time, the current detecting unit two that the phase current that rectified three-phase circuit is exported detects in real time and according to voltage detection unit one and two detection signals of described current detecting unit and the inverter control unit three-phase voltage source inverter controlled in conjunction with d-c bus voltage value given in advance, three-phase voltage source inverter and step-up transformer join; Described rotation speed detection unit and current detecting unit one all connect the boost chopper control unit, and boost chopper control unit and boost chopper join; Described voltage detection unit one and described current detecting unit two all connect inverter control unit, and inverter control unit and three-phase voltage source inverter are joined.
Described boost chopper comprises three groups of phases and the DC chopper circuit that connects, three groups of DC chopper circuit are formed by diode one serial connection of an IGBT module one and a forward conduction, and the positive output end that is connected in series a little respectively behind an inductance with rectified three-phase circuit of described IGBT module one and described diode one joins, the source electrode of described IGBT module one and the negative output terminal of rectified three-phase circuit join, and the negative electrode of described diode one is the positive output end of boost chopper; The boost chopper control unit joins with the IGBT driver element one that described IGBT module one is driven respectively, and IGBT driver element one joins with described IGBT module one.
Described boost chopper control unit is the PWM controller.
Described three-phase voltage source inverter by three groups respectively with boost chopper mutually and the series resonant inverter circuit that connects form, three groups of series resonant inverter circuit compose in series by two IGBT modules two and three groups of series resonant inverter circuit in the serial connection point of two of two IGBT modules join with the three-phase input end of step-up transformer respectively; Described inverter control unit drives with the IGBT that described IGBT module two is driven and protects respectively and protected location two joins, and IGBT drives and protected location two joins with described IGBT module two.
In three groups of described series resonant inverter circuit mutually on two IGBT modules two of serial connection all and be connected to a building-out capacitor.
Described inverter control unit is the PWM controller.
Be connected to filter circuit between described three-phase voltage source inverter and step-up transformer.
Described rectified three-phase circuit is the three-phase bridge rectifier circuit of being made up of six diodes.
Also comprise the voltage detection unit two that the output voltage to rectified three-phase circuit detects in real time; Described current detecting unit two comprises respectively current transformer one summation current transformer two that a phase current that rectified three-phase circuit is exported and b phase current detect in real time; Described rotation speed detection unit is high speed encoder or torque rotary speed sensor.
Described is the Thyristor Controlled rectification circuit by the soft starting circuit of buncher, the Thyristor Controlled rectification circuit with joined by buncher.
The utility model compared with prior art has the following advantages:
1, circuit design rationally, easy-to-connect and cost of investment be low.
2, result of use is good, is primarily aimed at the slip power feed-back type speed regulating control process of the high-power mesohigh wire-wound asynchronous motor of rated voltage under 10KV.Compare with the frequency converter timing technology, the utility model adopts modern high-frequency power electronic converter technology, carry out speed regulating control from the rotor-side of alternating current machine, be characterized in a converters is connected to the rotor-side of wound AC machine, by the control of rotor current amplitude or frequency being realized control to motor speed.Because the voltage lower (depending on the turn ratio and winding coefficient between stator winding and the rotor winding) of wire-wound asynchronous motor rotor-side, and the rotor-side converters is only handled slip power (part that is equivalent to the motor gross power), therefore the manufacture difficulty and the cost of converters will descend greatly, make this technical scheme have more cost advantage than high voltage converter.
3, compare with the inner feedback speed-regulating technology, the slip power feed-back type governing system that the utility model adopts voltage source inverter to constitute, slip power directly feeds into electrical network by rotor-side converter and step-up transformer, reuses.
4, can realize Instantaneous Control to the input and output electric current, make it become sine wave, thereby thoroughly eliminated the current harmonics problem of internal feedback chopping regulating speed controller, removed bulky high frequency output filter capacitor group, and the three-phase voltage source inverter that adopts the HF switch modulation a very important ability is arranged is the amplitude that it not only can control phase current, and phase place that can Control current, this ability makes it can be used as active reactive power compensator.Because exciting current need be provided, the power factor of asynchronous machine is lower (roughly about 0.8), the slip power feed-back type governing system that adopts voltage source inverter to constitute, can carry out the compensation of reactive current, provide motor needed exciting current, realize that the power factor of motor is 1.
5, reasonable in design, stable work in work, reliable in function and function admirable between each circuit module.In its electric motor starting process: supposing that the motor initial velocity is 0 and revolutional slip s=1, is 0 from the electric current of rotor side inflow converters; At this moment, the input voltage of Boost rectifier (being rectified three-phase circuit and boost chopper) is E
2(rotor winding maximum open circuit voltage).Start the work of PWM inverter, set up constant DC bus-bar voltage.The peak value that DC bus-bar voltage must be higher than rotor winding open circuit voltage is
After DC bus-bar voltage reached preset value, the three-phase thyristor phase control rectifier soft initiator that the motor rotor side joint is gone into was started working.Starting mode both can select then that threshold currents is soft to be opened, and also can be that the voltage double slanted is soft opens or kick is soft opens, and can decide as the case may be.To be that threshold currents is soft open with normally used, its output voltage is started from scratch and is increased rapidly, reach predefined current limit Im up to its output current, and then keep output current less than boosted voltage gradually under the condition of Im, up to rated voltage, motor speed is raise gradually, up to rated speed.The advantage of this Starting mode is that starting current is little, and can adjust starting current limit value (limit value of starting current must be set according to the detent torque of motor, is provided with too smallly, will make to start failure) on demand, and is little to electric network influencing.After motor reaches rated speed, excise soft initiator, insert the boost rectifier simultaneously, rotating speed is carried out tracking Control.
In speed regulation process: control of the present utility model is primarily aimed at chopper (being boost chopper) and inverter (being three-phase voltage source inverter).Wherein.Shunt chopper is adjusted the active power of control system transmission by regulating input current.Chopper outlet side direct voltage is constant by the control of PWM inverter, and the Boost rectifier is used to control motor speed, and slip power is delivered to three-phase voltage source inverter.The voltage of rotor winding constantly changes along with revolutional slip, voltage is improved and is kept by inverter that it is constant by the control of Boost rectifier.So during the control input current, the duty ratio of regulating the IGBT switching tube has promptly been controlled the output current of boost chopper, and then the input power of control motor, has also promptly controlled rotating speed.To governing system, the chopper input voltage can change with the variation of rotational speed setup.For the active power of control system, its input speed instruction also will inevitably change accordingly.So the Fast Dynamic followability is the important indicator of chopper.
The main effect of three-phase voltage source inverter (abbreviation inverter) be realize slip power to electrical network present and keep the constant of busbar voltage, simultaneously, realization is to the compensation of power factor.So inverter is had two control requirements, one requires the control dc voltage constant, and it is little that the output current harmonics distortion (THD) of being incorporated into the power networks is controlled in its two requirement, and keep unity power factor (unity power factor), serves as zero with the control system reactive power.Certainly in the case of necessary, also should send the perceptual idle or capacitive reactive power that needs to electrical network.The three-phase current of inverter output and the A phase voltage of electrical network are fed back to controller, three-phase current is carried out Park transform vector (3/2 conversion and rotation transformation, with the phase place of electrical network A phase voltage phase angle) as rotating coordinate transformation, then obtain the current component under the d-q coordinate system, wherein the d shaft current represents to be fed to the active current of electrical network, control this electric current and can realize control electromagnetic torque, and then the control rotating speed of motor; And the q axle represents to be fed to the reactive current of electrical network, controls this electric current and can realize control to reactive power, and then improve the power factor of system.
6, adopt three-phase thyristor phase control rectifier bridge soft initiator to replace traditional also soft mode of resistance at motor side, reduced the starting current of motor effectively, its starting current only is 50% of a standard electromotor hard reboot electric current, is 20% of high-efficiency electric motor hard reboot electric current.The current limiting characteristic of soft start are limit inrush currents effectively, avoids unnecessary impact moment and to the rush of current of distribution network, reduces the false triggering action of circuit disconnecting link and contactor effectively.To the motor of frequent start-stop, can effectively control the temperature rise of motor, prolong the life-span of motor greatly.
7, boost chopper has adopted the parallel-connection multiple structure, promptly the boost boost chopper with three groups of parallel connections replaces traditional single group boost circuit, make three groups of booster circuits share original one group of system power that booster circuit is born, thereby the current stress that has reduced single switching transistor runs on the safety zone to guarantee it, makes existing switching tube can be applicable to large-power occasions.Simultaneously, adopt the modulation system of triangular carrier misphase more effectively to suppress the high frequency ripple of diving to multiple inverter configuration, thus the raising of equivalence the system switching frequency.
In sum, the utility model circuit design rationally, easy-to-connect and cost of investment is low, result of use is good, stable work in work, can solve effectively that the existing current harmonics of traditional internal feedback chopping regulating speed system is excessive, inefficiency, be prone to inversion and defective and deficiency such as overturn.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a fundamental diagram of the present utility model.
Fig. 2 is a circuit block diagram of the present utility model.
Fig. 3 is circuit theory diagrams of the present utility model.
Fig. 4 is the control principle figure of the utility model boost chopper.
Fig. 5 is the control principle figure of the utility model three-phase voltage source inverter.
Description of reference numerals:
1-is by buncher; The 2-converters; The 2-1-rectified three-phase circuit;
The 2-2-boost chopper; 2-3-three-phase voltage source inversion 2-4-current detecting unit one;
Device;
2-5-voltage detection unit 2-61-current transformer one; 2-62-current transformer two;
One;
The 2-7-high speed encoder; 2-8-voltage detection unit two; The control of 2-9-boost chopper is single
Unit;
The 2-10-inverter is controlled single 2-11-IGBT driver element 2-12-IGBT and is driven and protect
Unit; One; Unit two;
The 2-13-filter circuit; The 3-step-up transformer; 4-high voltage supply net;
5-Thyristor Controlled rectified current 6-PWM signal generator; The 7-voltage transformer.
The road;
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3, the utility model comprises being serially connected in by the converters 2 of buncher 1 rotor-side with to the three-phase alternating voltage that converters 2 is exported adjusts and feeds back to the step-up transformer 3 of high voltage supply net 4, and the input/output terminal of described step-up transformer 3 joins with converters 2 and high voltage supply net 4 respectively.Described converters 2 comprises and the rectified three-phase circuit 2-1 that is connected in series mutually by the rotor winding of buncher 1, with rectified three-phase circuit 2-1 mutually and the boost chopper 2-2 that connects, with boost chopper 2-2 mutually and the three-phase voltage source inverter 2-3 that connects, current detecting unit one 2-4 that the output current of rectified three-phase circuit 2-1 is detected in real time, to the rotation speed detection unit that is detected in real time by the rotating speed of buncher 1, according to described rotation speed detection unit and current detecting unit one 2-4 institute's detection signal and in conjunction with the boost chopper control unit 2-9 that boost chopper 2-2 is controlled by the buncher tachometer value given in advance, voltage detection unit one 2-5 that the output voltage of boost chopper 2-2 is detected in real time, the current detecting unit two that the phase current that rectified three-phase circuit 2-1 is exported detects in real time and control single 2-10 according to voltage detection unit one 2-5 and two detection signals of described current detecting unit and in conjunction with the inverter that d-c bus voltage value given in advance is controlled three-phase voltage source inverter 2-3, three-phase voltage source inverter 2-3 and step-up transformer 3 join.Described rotation speed detection unit and current detecting unit one 2-4 all meet boost chopper control unit 2-9, and boost chopper control unit 2-9 and boost chopper 2-2 join.Described voltage detection unit one 2-5 and described current detecting unit two all meet inverter control unit 2-10, and inverter control unit 2-10 and three-phase voltage source inverter 2-3 join.
3 of described three-phase voltage source inverter 2-3 and step-up transformers are connected to filter circuit 2-13, and described filter circuit 2-13 is corresponding to be made up of capacitor C 6, C7 and C8 and inductance L 4, L5 and L6.Described rectified three-phase circuit 2-1 is the three-phase bridge rectifier circuit of being made up of six diodes, and six diodes forming three-phase bridge rectifier circuit are specially diode D1-D6, described three-phase bridge rectifier circuit and be serially connected with A.C. contactor KM1 by 1 of buncher.Simultaneously, the utility model also comprises voltage detection unit two 2-8 that the output voltage to rectified three-phase circuit 2-1 detects in real time.Described current detecting unit two comprises respectively current transformer one 2-61 summation current transformer two 2-62 that a phase current that rectified three-phase circuit 2-1 is exported and b phase current detect in real time.Described rotation speed detection unit is high speed encoder 2-7 or torque rotary speed sensor.
Described is Thyristor Controlled rectification circuit 5 by the soft starting circuit of buncher 1, Thyristor Controlled rectification circuit 5 with joined by buncher 1.Described Thyristor Controlled rectification circuit 5 is the rectified three-phase circuit of being made up of 6 thyristor K11-K16, is serially connected with resistance R 1 and described rectified three-phase circuit between the positive-negative output end of described rectified three-phase circuit and is serially connected with A.C. contactor KM3 by 1 of buncher.Describedly be serially connected with K switch 1 between buncher 1 and described rectified three-phase circuit.
In conjunction with Fig. 4, in the present embodiment, described boost chopper 2-2 comprises three groups of phases and the DC chopper circuit that connects, three groups of DC chopper circuit are formed by diode one serial connection of an IGBT module one and a forward conduction, and the positive output end that is connected in series a little respectively behind an inductance with rectified three-phase circuit 2-1 of described IGBT module one and described diode one joins, the negative output terminal of the source electrode of described IGBT module one and rectified three-phase circuit 2-1 joins, and the negative electrode of described diode one is the positive output end of boost chopper 2-2.Described boost chopper control unit 2-9 joins with IGBT driver element one 2-11 that described IGBT module one is driven respectively, and IGBT driver element one 2-11 and described IGBT module one are joined.Described boost chopper control unit 2-9 is the PWM controller.Described IGBT module one is made up of an IGBT pipe and an anti-fast recovery diode that is attempted by on the described IGBT pipe.
IGBT module one in three groups of DC chopper circuit is respectively IGBT1, IGBT2 and IGBT3, diode one in three groups of DC chopper circuit is respectively D7 respectively, D8 and D9, wherein IGBT1 is connected in series mutually with D7 and the two serial connection point joins with the positive output end of rectified three-phase circuit 2-1 behind capacitor and inductor L1, IGBT2 is connected in series mutually with D8 and the two serial connection point joins with the positive output end of rectified three-phase circuit 2-1 behind capacitor and inductor L2, IGBT3 is connected in series mutually with D8 and the two serial connection point joins diode D7 with the positive output end of rectified three-phase circuit 2-1 behind capacitor and inductor L3, the negative electrode of D8 and D9 joins.Simultaneously, on the positive-negative output end of three groups of DC chopper circuit and be connected to polar capacitor C1 and common electric capacity C2.
In conjunction with Fig. 5, described three-phase voltage source inverter 2-3 by three groups respectively with boost chopper 2-2 mutually and the series resonant inverter circuit that connects form, three groups of series resonant inverter circuit compose in series by two IGBT modules two and three groups of series resonant inverter circuit in the serial connection point of two of two IGBT modules join with the three-phase input end of step-up transformer 3 respectively.Described inverter control unit 2-10 drives with the IGBT that described IGBT module two is driven and protects respectively and protected location two 2-12 join, and IGBT driving and protected location two 2-12 and described IGBT module two are joined.In the present embodiment, in three groups of described series resonant inverter circuit mutually on two IGBT modules two of serial connection all and be connected to a building-out capacitor.Described IGBT module two is made up of an IGBT pipe and an anti-fast recovery diode that is attempted by on the described IGBT pipe.Described inverter control unit 2-10 is the PWM controller.
IGBT module two in three groups of series resonant inverter circuit is respectively IGBT4, IGBT5, IGBT6, IGBT7, IGBT8 and IGBT9, and the building-out capacitor in three groups of series resonant inverter circuit is respectively capacitor C 3, C4 and C5, wherein IGBT4 be connected in series mutually with IGBT5 and and be connected to building-out capacitor C3, IGBT6 be connected in series mutually with IGBT7 and and be connected to building-out capacitor C4, IGBT8 is connected in series mutually with IGBT9 and and is connected to building-out capacitor C5.Serial connection point between serial connection point, IGBT6 and IGBT7 between IGBT4 and IGBT5 and the serial connection point between IGBT8 and IGBT9 are respectively the abc three-phase output end of three-phase voltage source inverter three-phase alternating current that 2-3 exports.Simultaneously, also comprise the voltage transformer 7 that the phase voltage to three-phase voltage source inverter three-phase electricity that 2-3 exports detects in real time.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection range of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
1. high-power mesohigh asynchronous motor speed-regulating system of slip power feed-back type, it is characterized in that: comprise being serially connected in by the converters (2) of buncher (1) rotor-side with to converters (2) three-phase alternating voltage of being exported and adjust and feed back to the step-up transformer (3) of high voltage supply net (4), the input/output terminal of described step-up transformer (3) joins with converters (2) and high voltage supply net (4) respectively; Described converters (2) comprises and the rectified three-phase circuit (2-1) that is connected in series mutually by the rotor winding of buncher (1), with rectified three-phase circuit (2-1) mutually and the boost chopper that connects (2-2), with boost chopper (2-2) mutually and the three-phase voltage source inverter that connects (2-3), the current detecting unit one (2-4) that the output current of rectified three-phase circuit (2-1) is detected in real time, to the rotation speed detection unit that is detected in real time by the rotating speed of buncher (1), according to described rotation speed detection unit and current detecting unit one (2-4) institute's detection signal and in conjunction with the boost chopper control unit of boost chopper (2-2) being controlled by the buncher tachometer value (2-9) given in advance, the voltage detection unit one (2-5) that the output voltage of boost chopper (2-2) is detected in real time, the current detecting unit two that the phase current that rectified three-phase circuit (2-1) is exported detects in real time and according to voltage detection unit one (2-5) and two detection signals of described current detecting unit and the inverter control unit (2-10) three-phase voltage source inverter (2-3) controlled in conjunction with d-c bus voltage value given in advance, three-phase voltage source inverter (2-3) is joined with step-up transformer (3); Described rotation speed detection unit and current detecting unit one (2-4) all connect boost chopper control unit (2-9), and boost chopper control unit (2-9) joins with boost chopper (2-2); Described voltage detection unit one (2-5) and described current detecting unit two all connect inverter control unit (2-10), and inverter control unit (2-10) joins with three-phase voltage source inverter (2-3).
2. according to the high-power mesohigh asynchronous motor speed-regulating system of the described slip power feed-back type of claim 1, it is characterized in that: described boost chopper (2-2) comprises three groups of phases and the DC chopper circuit that connects, three groups of DC chopper circuit are formed by diode one serial connection of an IGBT module one and a forward conduction, and the positive output end that is connected in series a little respectively behind an inductance with rectified three-phase circuit (2-1) of described IGBT module one and described diode one joins, the negative output terminal of the source electrode of described IGBT module one and rectified three-phase circuit (2-1) joins, and the negative electrode of described diode one is the positive output end of boost chopper (2-2); Boost chopper control unit (2-9) joins with the IGBT driver element one (2-11) that described IGBT module one is driven respectively, and IGBT driver element one (2-11) joins with described IGBT module one.
3. according to the high-power mesohigh asynchronous motor speed-regulating system of the described slip power feed-back type of claim 2, it is characterized in that: described boost chopper control unit (2-9) is the PWM controller.
4. according to claim 1, the high-power mesohigh asynchronous motor speed-regulating system of 2 or 3 described slip power feed-back types, it is characterized in that: described three-phase voltage source inverter (2-3) by three groups respectively with boost chopper (2-2) mutually and the series resonant inverter circuit that connects form, three groups of series resonant inverter circuit compose in series by two IGBT modules two and three groups of series resonant inverter circuit in the serial connection point of two of two IGBT modules join with the three-phase input end of step-up transformer (3) respectively; Described inverter control unit (2-10) drives with the IGBT that described IGBT module two is driven and protects respectively and protected location two (2-12) joins, and IGBT drives and protected location two (2-12) joins with described IGBT module two.
5. according to the high-power mesohigh asynchronous motor speed-regulating system of the described slip power feed-back type of claim 4, it is characterized in that: in three groups of described series resonant inverter circuit mutually on two IGBT modules two of serial connection all and be connected to a building-out capacitor.
6. according to the high-power mesohigh asynchronous motor speed-regulating system of the described slip power feed-back type of claim 4, it is characterized in that: described inverter control unit (2-10) is the PWM controller.
7. according to claim 1, the high-power mesohigh asynchronous motor speed-regulating system of 2 or 3 described slip power feed-back types, it is characterized in that: be connected to filter circuit (2-13) between described three-phase voltage source inverter (2-3) and step-up transformer (3).
8. according to claim 1, the high-power mesohigh asynchronous motor speed-regulating system of 2 or 3 described slip power feed-back types, it is characterized in that: the three-phase bridge rectifier circuit of described rectified three-phase circuit (2-1) for forming by six diodes.
9. according to claim 1, the high-power mesohigh asynchronous motor speed-regulating system of 2 or 3 described slip power feed-back types, it is characterized in that: also comprise the voltage detection unit two (2-8) that the output voltage to rectified three-phase circuit (2-1) detects in real time; Described current detecting unit two comprises respectively current transformer one (2-61) summation current transformer two (2-62) that a phase current that rectified three-phase circuit (2-1) is exported and b phase current detect in real time; Described rotation speed detection unit is high speed encoder (2-7) or torque rotary speed sensor.
10. according to claim 1, the high-power mesohigh asynchronous motor speed-regulating system of 2 or 3 described slip power feed-back types, it is characterized in that: described soft starting circuit by buncher (1) is Thyristor Controlled rectification circuit (5), Thyristor Controlled rectification circuit (5) with joined by buncher (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201623948U CN201656905U (en) | 2010-04-16 | 2010-04-16 | Speed regulating system of a slip power feedback type asynchronous motor with large power and medium-high voltage |
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| CN2010201623948U CN201656905U (en) | 2010-04-16 | 2010-04-16 | Speed regulating system of a slip power feedback type asynchronous motor with large power and medium-high voltage |
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| CN201656905U true CN201656905U (en) | 2010-11-24 |
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| CN102170255A (en) * | 2011-05-11 | 2011-08-31 | 马鞍山市瑞华电气科技有限公司 | Motor starting device |
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| CN105391284B (en) * | 2015-10-29 | 2017-11-14 | 中国科学院广州能源研究所 | Reduce the lower inverter output voltage THD of three phase rectifier type load control system and method |
| CN108521849A (en) * | 2015-12-28 | 2018-09-11 | 大金工业株式会社 | The control device of power conversion device |
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| CN107634538A (en) * | 2017-09-29 | 2018-01-26 | 苏州英威腾电力电子有限公司 | A kind of permanent magnet coupling governing system and permanent magnet coupling speed regulating method |
| CN113420521A (en) * | 2021-07-05 | 2021-09-21 | 中国科学院电工研究所 | Real-time simulation modeling method for three-phase linear induction motor subsection power supply switching process |
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